EP3623543A1 - Planches de plancher - Google Patents

Planches de plancher Download PDF

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Publication number
EP3623543A1
EP3623543A1 EP19206570.4A EP19206570A EP3623543A1 EP 3623543 A1 EP3623543 A1 EP 3623543A1 EP 19206570 A EP19206570 A EP 19206570A EP 3623543 A1 EP3623543 A1 EP 3623543A1
Authority
EP
European Patent Office
Prior art keywords
joint
surface layer
floorboards
joint edge
core
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP19206570.4A
Other languages
German (de)
English (en)
Inventor
Magnus Wallin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valinge Innovation AB
Original Assignee
Valinge Innovation AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valinge Innovation AB filed Critical Valinge Innovation AB
Publication of EP3623543A1 publication Critical patent/EP3623543A1/fr
Pending legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F15/00—Flooring
    • E04F15/02—Flooring or floor layers composed of a number of similar elements
    • E04F15/02038—Flooring or floor layers composed of a number of similar elements characterised by tongue and groove connections between neighbouring flooring elements
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F15/00—Flooring
    • E04F15/02—Flooring or floor layers composed of a number of similar elements
    • E04F15/02005—Construction of joints, e.g. dividing strips
    • E04F15/02033—Joints with beveled or recessed upper edges
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F15/00—Flooring
    • E04F15/02—Flooring or floor layers composed of a number of similar elements
    • E04F15/04—Flooring or floor layers composed of a number of similar elements only of wood or with a top layer of wood, e.g. with wooden or metal connecting members
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F15/00—Flooring
    • E04F15/02—Flooring or floor layers composed of a number of similar elements
    • E04F15/04—Flooring or floor layers composed of a number of similar elements only of wood or with a top layer of wood, e.g. with wooden or metal connecting members
    • E04F15/041—Flooring or floor layers composed of a number of similar elements only of wood or with a top layer of wood, e.g. with wooden or metal connecting members with a top layer of wood in combination with a lower layer of other material
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F2201/00—Joining sheets or plates or panels
    • E04F2201/01—Joining sheets, plates or panels with edges in abutting relationship
    • E04F2201/0153—Joining sheets, plates or panels with edges in abutting relationship by rotating the sheets, plates or panels around an axis which is parallel to the abutting edges, possibly combined with a sliding movement
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F2201/00—Joining sheets or plates or panels
    • E04F2201/02—Non-undercut connections, e.g. tongue and groove connections
    • E04F2201/023—Non-undercut connections, e.g. tongue and groove connections with a continuous tongue or groove
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1052—Methods of surface bonding and/or assembly therefor with cutting, punching, tearing or severing
    • Y10T156/1062—Prior to assembly
    • Y10T156/1064—Partial cutting [e.g., grooving or incising]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1052—Methods of surface bonding and/or assembly therefor with cutting, punching, tearing or severing
    • Y10T156/1062—Prior to assembly
    • Y10T156/1066—Cutting to shape joining edge surfaces only
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1052—Methods of surface bonding and/or assembly therefor with cutting, punching, tearing or severing
    • Y10T156/1082—Partial cutting bonded sandwich [e.g., grooving or incising]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49616—Structural member making
    • Y10T29/49623—Static structure, e.g., a building component
    • Y10T29/49629—Panel

Definitions

  • the present invention generally concerns a method relating to manufacturing panels, especially floorboards, as well as a floorboard produced according to such method.
  • embodiments of the present invention relate to floorboards having mechanical joint systems, a core and a surface layer with curved edge portions located below the panel surface.
  • embodiments of the invention relate to a floorboard with such edge portions and a method to produce such floorboard.
  • Embodiments of the present invention are particularly suited for use in floors with a top surface layer including wood veneer, laminate, foils, a layer of paint or a layer which comprises a mix of wood fibres, binders and wear resistant particles and the like.
  • a top surface layer including wood veneer, laminate, foils, a layer of paint or a layer which comprises a mix of wood fibres, binders and wear resistant particles and the like.
  • the following description of known technique, problems of known systems as well as objects and features of the invention will therefore as non-limiting examples be aimed mainly at this field of application.
  • the invention can be used in any building panels e.g. floor panels or wall panels having a top surface layer, which are intended to be joined in different patterns by means of a joint system.
  • the visible surface of the installed floor panel is called “front side”, while the opposite side of the floor panel facing the subfloor is called “rear side”.
  • "Horizontal plane” relates to a plane, which is parallel to the front side. Directly adjoining upper parts of two neighboring joint edges of two joined floor panels together define a “vertical plane” perpendicular to the horizontal plane.
  • the outer parts of the floor panel at the edge of the floor panel between the front side and the rear side are called “joint edge”.
  • the joint edge has several “joint surfaces” which can be vertical, horizontal, angled, rounded, beveled etc. These joint surfaces may exist on different materials, for instance laminate, fiberboard, wood, plastic, metal (in particular aluminum) or sealing materials.
  • joint system is meant cooperating connecting means which interconnect the floor panels vertically and/ or horizontally.
  • mechanical joint system is meant that locking can take place without glue. Mechanical joint systems can, however, in many cases also be joined by glue.
  • locking groove side is meant the side of the floor panel in which part of the horizontal locking means has a locking groove whose opening faces to the rear side.
  • locking element side is meant the side of the floor panel in which part of the horizontal locking means has a locking element, which cooperates with the locking groove.
  • decorative surface layer is meant a surface layer, which is mainly intended to give the floor its decorative appearance.
  • Weight resistant surface layer relates to a high abrasive surface layer, which is mainly adapted to improve the durability of the front side.
  • a “decorative wear resistant surface layer” is a layer, which is intended to give the floor its decorative appearance as well as improve the durability of the front side.
  • a surface layer is applied to the core.
  • WFF Wood fibre binders and wear resistant particles and the like that is compressed under a pressure given the result of a compact surface layer with different kind of visual effect.
  • the powder can be scattered.
  • FIGs. 1a - 1d show according to known art, how laminate flooring is produced.
  • a floor element 3, FIGs. 1a - b in the form of a large laminated board, is sawn into several individual floor panels 2, FIG. 1c , which are then further machined to floorboards 1, 1', FIG. 1d .
  • the floor panels are individually machined along their edges to floorboards with mechanical joint systems on the edges. The machining of the edges is carried out in advanced milling machines where the floor panel is exactly positioned between one or more chains and belts or similar, so that the floor panel can be moved at high speed and with great accuracy such that it passes a number of milling motors, which are provided with diamond cutting tools or metal cutting tools and which machine the edge of the floor panel and forms the joint system.
  • a floorboard 1, 1', FIG. 1d , having a mechanical joint system has active locking surfaces in the tongue 10 (the tongue side of the floorboard 1') and the tongue groove 9 (the groove side of the floorboard 1).
  • Laminate flooring and wood veneer flooring are usually composed of a body 30 including a 6 - 12 mm fiberboard, a 0.1 - 0.8 mm thick top surface layer 31 and a 0.1 - 0.6 mm thick lower balancing layer 32.
  • the top surface layer 31 provides appearance and durability to the floorboards.
  • the body provides stability and the balancing layer keeps the board leveled when the relative humidity (RH) varies during the year.
  • the RH can vary between 15% and 90%.
  • floorboards In addition to such traditional floors, floorboards have been developed in recent years, which do not require the use of glue but which are instead joined mechanically by means of so-called mechanical joint systems. These systems comprise locking means, which lock the boards horizontally and vertically.
  • the mechanical joint systems can be formed by machining the core 30 of the board 1, 1'. Alternatively, parts of the joint system can be made of a separate material, which is integrated with the floorboard.
  • the floorboards are joined, i.e. interconnected or locked together in a floating manner, by various combinations of angling, snapping, insertion along the joint edge and by fold down methods using joint systems comprising separate displaceable tongues generally factory inserted in a groove at the short edges.
  • a laminate floor panel with a thin surface layer can be formed with beveled edges and then looks like a solid wood plank.
  • the advantage of a floating flooring which is not connected to a sub floor with, for example, nails or glue, is that a change in shape due to different degrees of relative humidity RH can occur concealed under basemouldings and the floorboards can, although they swell and shrink, be joined without visible joint gaps. Installation can, especially by using mechanical joint systems, be laid quickly and easily.
  • the drawback is that the continuous floor surface must as a rule be limited even in the cases where the floor comprises of relatively dimensionally stable floorboards, such as laminate floor with a fiberboard core or wooden floors composed of several layers with different fibre directions. The reason is that such floors as a rule shrink and swell as the RH varies.
  • a solution for large floor surfaces is to divide the large surface into smaller surfaces with expansion strips. Without such a division, it is a risk that the floor when shrinking will change in shape so that it will no longer be covered by basemouldings. Also the load on the joint system will be great since great loads must be transferred when a large continuous surface is moving. The load will be particularly great in passages between different rooms.
  • expansion strips are joint profiles that are generally aluminum or plastic section fixed on the floor surface between two separate floor units. They collect dirt, give an unwanted appearance and are rather expensive. Due to these limitations on maximum floor surfaces, laminate floorings have only reached a small market share in commercial applications such as hotels, airports, and large shopping areas. More unstable floors, such as wooden floors, may exhibit still greater changes in shape. The factors that above all affect the change in shape of homogenous wooden floors are fibre direction and the kind of wood. A homogenous oak floor is very stable along the fibre direction, i.e. in the longitudinal direction of the floorboard.
  • a floating floor which a) may have a large continuous surface without expansion joint profiles, b) may have a non-visible joint gap, and c) may have a bevel with the same visual effects as for a more expensive wood based floorboard.
  • a method for producing such a floating floor without the above drawbacks in particular a manufacturing method which may be less complex, thereby speeding up the manufacturing and decreasing the cost.
  • a first object of an exemplary embodiment of the invention is to enable improved joint systems, so floorboards are possible to be installed as semi-floating floors in large continuous surfaces even though great dimensional changes may occur as the relative humidity changes.
  • a second object of an exemplary embodiment of the invention is to provide joint systems, which allow considerable movement between floorboards while preventing moisture from penetrating into, or at least diminishing moisture from penetrating into, the joint gaps, and without large and deep dirt-collecting joint gaps and/or where open joint gaps can be excluded.
  • a third object of an exemplary embodiment of the invention is to provide joint systems, which allow a considerable movement between floorboards with bevels at the edges that are strong.
  • a fourth object of an exemplary embodiment of the invention is to enable improved manufacturing of wood veneer floorboards with a bevel, which can also be semi-floating.
  • a fifth object of an exemplary embodiment of the invention is to enable the possibility to apply a bevel to a floorboard with a production method that is less complex and thereby requires less complex machines and machines at low cost, and allow a production at high speed.
  • embodiments of the invention include floorboards provided with an upper decorative surface layer.
  • the floorboards comprise a mechanical joint system at two opposite edges for locking together adjacent joint edges of two adjacent floorboards.
  • the decorative surface layer at a first joint edge and the decorative surface layer at a second joint edge overlap each other at the mechanical joint system at an overlapping part, the overlapping part is preferably located under the horizontal main surface of the decorative surface layer, a first joint surface of the first joint edge faces a second joint surface at the second joint edge and the first and the second joint surfaces are essentially parallel and essentially horizontal.
  • an exemplary preferred embodiment of the invention is that the first and the second joint surfaces are in contact.
  • Another preferred exemplary embodiment is that the first and the second joint surfaces extend in a plane which is about 0-10° to the horizontal plane.
  • embodiments of the invention include a method for manufacturing a floor panel, the method comprises the steps of:
  • an exemplary preferred embodiment of the invention is that the method further comprises the step of forming a mechanical joint system at the edge of the floor panel.
  • An advantage of some exemplary embodiments of the invention is with the special design of the mechanical joint system allowing semi-floating installation, and regardless of shrinking or swelling of the floorboard due to temperature or humidity changes, any visible openings between the floor panels are eliminated.
  • An advantage of some exemplary embodiments of the invention is that with the special design of the mechanical joint system allowing semi-floating installation giving the possibilities to seal the joint system from moisture without the possibilities for moisture to penetrate or with the extra help of a vapor barrier disposed either under the overlapping surface or on the surface being overlapped.
  • An advantage of some exemplary embodiments of the invention is that the visible joint opening will have the same kind of wood and fibre direction as the top surface layer and the appearance will be identical with that of a homogeneous wooden floor.
  • An advantage of some exemplary embodiments of the invention is that support is provided for an overlapping joint edge by the facing top surface layer of the locking joint edge being horizontal.
  • Still further advantage of some exemplary embodiments of the invention is that it enables the possibility to apply a bevel to a floorboard with a production method that is less complex and thereby requires less complex machines and machines at low cost, and production at high speed.
  • a further advantage of some exemplary embodiments of the invention is that a wood veneer floorboard with a bevel can be produced at a low production cost and still have the same visual effects as for a more expensive wood based floorboard, i.e. a floorboard with a thick top surface layer of solid wood floorboard.
  • a further advantage of some exemplary embodiments of the invention is that a floorboard with a surface of wood fibre mix with a bevel can be produced at a low production cost.
  • Still another advantage of some exemplary embodiments of the invention is the decreased tolerances though high-speed production of floorboards with a bevel.
  • the method described above for manufacturing a floor element comprising a surface following grooves or even local cavities formed in the core can also be used to form decorative depressions in the surface of a floorboard between two edges.
  • Such structures are difficult to form with the known production methods where compression of the surface layer and/or the core is used to obtain for example local depressions in the surface.
  • FIGs. 2-16 and the related description below are used to explain certain principles of the invention and to show examples of embodiments that can be used in the invention.
  • the illustrated embodiments are only examples. It should be emphasized that all types of mechanical joint system of floorboard allowing vertical folding and/or vertical locking, can be used and applicable part of this description form a part of the present invention.
  • the present invention of a special design of a mechanical joint system that allows semi-floating installation, and a method for producing such building panels are particularly suited for but not limited to use in:
  • FIGs. 2a - 2b illustrate first exemplary embodiments of the special design of a mechanical joint system for mechanical joining of floorboards 1, 1', that allow semi-floating installation, without a visible joint gap and without using high-grade wood, according to the invention.
  • the floorboard comprises a surface layer 31 applied on top of a core 30.
  • the joined floorboards have a horizontal plane (HP), which is parallel to the horizontal main floor surface and comprises outer parts of the surface layer, and a vertical plane (VP), which is perpendicular to the horizontal plane.
  • the joint system has mechanically cooperating locking means for vertical joining parallel to the vertical plane and for horizontal joining parallel to the horizontal plane of a first and a second joint edge 4a, 4b.
  • the vertical locking means comprises a tongue 10, which cooperates with a tongue groove 9.
  • the horizontal locking means comprise a strip 6 with a locking element 8, which cooperates with a locking groove 14.
  • the floorboards 1, 1' have, in an area TT of a first 4a and second 4b joint edge a first 18 and second 19 joint edge portion which are defined by the area between the upper parts of the tongue groove 9 and the horizontal plane HP.
  • FIGs. 2a - 2b show edge parts which are sharp in FIG. 2a or rounded in FIG. 2b and comprise a first upper horizontal plane H1 extending through a surface layer 31, a second intermediate horizontal plane H2 extending through a part of the panel core 30 and a lower horizontal plane H3 extending through a portion of the surface layer 31.
  • FIG. 2a illustrates surface layer H1a in the upper first horizontal plane H1 parallel to the main floor surface HP, surface layer H3a in the lower third horizontal plane H3 located under the main floor surface HP, and a part of the core H2a in the second horizontal plane H2 between first and third horizontal planes H1, H3.
  • the surface layers H1a and H3a may have substantially the same thickness.
  • the core H2a is preferably thicker than surface layers H1a and H3a.
  • the locking groove 14 and the locking element 8 can be formed with a small play or space as shown in FIG. 2a and this allows the floorboards to move horizontally such that swelling and shrinking is partly or completely compensated and that a semi-floating floor is obtained.
  • the first 4a joint edge and the decorative surface layer 31 of the second 4b joint edge overlap each other at the mechanical joint system at an overlapping part 31a, and allow that such movement is obtained without any visible joint gaps.
  • the overlapping part 31a is located under the horizontal main surface HP of the decorative surface layer 31.
  • the first joint surface 4c of the first 4a joint edge faces a second joint surface 4d of the second 4b joint edge and the first and the second joint surfaces are essentially parallel and essentially horizontal.
  • the first and the second joint surfaces 4c, 4d are in contact, and the first and the second joint surfaces extend in a plane which is about 0-10° to the horizontal plane and they can be formed with a precise fit and this will prevent moisture from penetrating into the joint.
  • the joint system in FIG. 2b shows that the joint can be formed with tight fit or even pretension vertically and/or horizontally and this can be used to improve the moisture resistance.
  • the upper part of the surface layer 31a can be machined and adjusted slightly in order to eliminate production tolerances. This means that the surface layer 31a over the tongue 10 can be made thinner than the surface layer 31 covering the main part of the floorboard 1'.
  • the portion TT can either be divided up into an upper joint edge portion and lower joint edge portion or not divided up into portions.
  • first joint edge 4a has a joint edge portion 18 and in a corresponding area the second edge 4b a joint edge portion 19.
  • a portion of the surface layer 31 of joint edge portion 18 is located under the horizontal plane HP of the second joint edge 4b. More precisely a formed bevel is located under the horizontal plane HP if the horizontal plane HP is on the same level as the main floor surface.
  • a first joint surface 4c of the first joint edge 4a faces a second joint surface 4d of the second joint edge 4b, and the first and the second joint surfaces are essentially parallel and essentially horizontal.
  • the first and the second joint surfaces 4c, 4d of the floorboards 1, 1' can then be in contact.
  • the first and the second joint surfaces of the floorboards 1, 1' extend in a plane which is about 0-10° to the horizontal plane.
  • FIGs. 3a - 3d illustrate a second exemplary embodiment with different dimensions of the special design of a mechanical joint system that allows semi-floating installation, according to the invention.
  • the area TT of first joint edge 4a and second joint edge 4b are divided up into portions.
  • the first joint edge 4a has a lower joint edge portion 17 positioned between the tongue 10 and the surface layer 31, and an upper joint edge portion 18' that is closer to the main floor surface HP than the lower joint edge portion 17, and the second joint edge 4b has a lower joint edge portion 16 positioned between the tongue 10 and the surface layer 31, and an upper joint edge portion 19' that is closer to the main floor surface HP than the lower joint edge portion 16.
  • FIG. 4 illustrates a special design of a mechanical joint system that allows semi-floating installation.
  • the first joint edge portion 18 is sloping away from the main floor surface HP.
  • the second joint edge portion 19 with the surface layer 31 and a part of the core is overlapping the sloping surface layer 31 and the core 30 of the first joint edge portion 18.
  • FIGs. 5a - 5b illustrate a third exemplary embodiment of the special design of a mechanical joint system that allows semi-floating installation, according to the invention.
  • the portion TT of second joint edge 4b is divided up into portions while the first joint edge 4a is not.
  • the second joint edge 4b has a lower joint edge portion 16 positioned between the tongue 10 and the surface layer 31, and the upper joint edge portion 19' is closer to the main floor surface HP than the lower 16.
  • FIGs. 3b, 3d and 5b illustrate the boards pressed together in their inner position, with the joint edge portions 16, 17 or 16, 18 in contact with each other, and Figs. 3a, 3c and 5a illustrate the boards pulled out to their outer position, with the joint edge portions 18', 19' or 18, 19' spaced from each other.
  • the overlapping joint edge portion 19' is made in the groove side, i.e. in the joint edge having a groove 9, in the second joint edge 4b.
  • the overlapping joint edge portion 18, 18' can also be made in the tongue side, i.e. in the joint edge having a tongue 10, or in the first joint edge 4a as illustrated in FIG. 6 .
  • a piece of flexible material can be applied reducing movements between two mechanically joined floor panels in the vertical plane VP on either the tongue or groove side, or both sides.
  • Examples of flexible materials are plastic, rubber, and silicon or like material.
  • a piece of moisture removal material can be applied in the vertical plane VP on either the tongue or groove side, or both sides. This material prevents moisture to enter between two floor panels.
  • the joint system has a play JO of for instance 0.2 mm. If the overlap in this pressed-together position is 0.2 mm, the boards can, when being pulled apart, separate from each other 0.2 mm without a visible joint gap being seen from the surface.
  • the embodiments will not have an open joint gap because the joint gap will be covered by the overlapping second joint edge portion 19, 19' in FIGs. 3-5 and by overlapping first joint edge portion 18 in FIG. 6 . It is an advantage if the locking element 6 and the locking grove 12 are such that the possible separation, i.e. the play, is slightly smaller than the amount of overlapping.
  • a small overlapping for example 0.05 mm, should exist in the joint even when the floorboards are pulled apart and a pulling force is applied to the joint.
  • This overlapping will prevent moisture from penetrating into the joint.
  • the joint edges will be strong since the overlapping edge portion 19, 19' in second joint edge 4b will be supported by the horizontal surface of the edge portion 18 of the first joint edge 4a of the adjacent floorboard inFIGs. 2, 4 and 5, or even stronger inFIGs. 3a - 3d, since the lower edge portion 17 will support the upper edge portion 19'.
  • the decorative groove can be made very shallow and all dirt collecting in the groove can easily be removed by a vacuum cleaner in connection with normal cleaning. No dirt or moisture can penetrate into the joint system and down to the tongue 10.
  • the visible and open joint gap can be 0.1 mm, the compression 0.1 mm and the overlap 0.1 mm.
  • the floorboards' possibility of moving will then be 0.3 mm all together and this considerable movement can be combined with a small visible open joint gap and a limited horizontal extent of the overlapping joint edge portion 19, 19' that does not have to constitute a weakening of the joint edge. This is due to the fact that the overlapping joint edge portion 19, 19' is very small and also made in the strongest part of the floorboard, which comprises of the laminate surface, and melamine impregnated wood fibres.
  • Such a joint system which thus can provide a considerable possibility of movement without visible joint gaps, can be used in all the applications described above. Furthermore the joint system is especially suitable for use in broad floorboards, on the short sides, when the floorboards are installed in parallel rows and the like, i.e. in all the applications that require great mobility in the joint system to counteract the dimensional change of the floor. It can also be used in the short sides of floorboards, which constitute a frame, or frieze around a floor installed in a herringbone pattern.
  • the vertical extent of the overlapping joint edge portion i.e. the depth GD of the joint opening, is less than 0.1 times the floor thickness T.
  • the overlapping joint edge can further be reinforced at the edge if desirable. For example by pre-processing the surface layer so the surface layer is reinforced at the edges or by an extra layer of reinforced material on the core of the grooves.
  • FIGs. 7a - 7c illustrate in detail some parts of the exemplary embodiments of FIGs. 2 - 6 , according to the invention.
  • the surface layer 31 and a part of the core 30 in second joint edge 4b of edge 1 are overlapping the surface layer in the adjacent floor board edge 1', or as in FIG. 7a the surface layer 31 and a part of the core 30 in floor board edge 1' of first joint edge 4a are overlapping the surface layer in the adjacent floor board edge 1.
  • the edge part comprises a surface layer H1a in the first upper horizontal plane H1 horizontal to the main floor surface, a part of a panel core H2a and a surface layer H3a in the lower horizontal plane H3 lower than the main floor surface.
  • a fifth horizontal plane H5 is parallel to the tongue 10 in the first joint edge 4a in FIGs. 7b - 7c
  • a sixth horizontal plane H6 is parallel to strip 6 of the locking element 8 in second joint edge 4b in FIG. 7a .
  • FIG. 7a illustrates the surface layer H1a in the upper first horizontal plane H1 parallel to the main floor surface HP, the surface layer H3a in the lower third horizontal plane H3 located under the main floor surface HP, and a part of the core H2a in the intermediate second horizontal plane H2 between the first and third horizontal planes.
  • the invention provides further the exemplary embodiments of a production method to form deep core grooves 20', 20" in a panel with a thin surface layer.
  • the advantage is that such deep core grooves can be formed very accurately without any substantial compression of the core, and in a production method with decreased production time and using little energy as well, thereby reducing the production cost.
  • FIGs. 8 - 16 show parts of a production line illustrating exemplary embodiments of how to produce beveled building panels, decreasing the production cost, time and energy, according to the invention.
  • the process of producing floorboards/building panels comprising pre-forming the core material of the whole floor element 3, without separating the floor panels 2 from each other, applying a top surface layer of e.g. wood veneer, laminate, layer of paint or a solid layer comprising wood fibre mix, binders and wear resistant particles or similar, forming the top surface layer 31 around the pre-formed core groves 20', 20" in the core material 30.
  • the floor element 3 is then separated into floor panels 2.
  • the method for manufacturing the floor panels 2 is here now described in the following method steps:
  • FIG. 8a illustrates an exemplary embodiment of a production method to pre-form a core 30 with core grooves 20, 20', 20", which are intended to be covered with a surface layer 31, and formed as surface depressions in a floorboard preferably as beveled edges, according to the invention.
  • FIG. 8a shows machining by rotating cutting tools.
  • saw blades 51 on an axel 50 can be used to cut core groves 20, 20', 20" which can be positioned such that they will cover an edge portion above the tongues 10 and grooves 9 in the joint system that will be formed at the edges of the floorboard as shown in FIG. 8b .
  • Several other methods can be used to form the grooves by machining.
  • the depressions can have a surface structure of core grooves 20, 20', 20" that can follow the sides of one floor panel on the two long sides, or follow just one long side, or further can follow the short sides or only the short sides can be followed by core grooves, depending on where the joint systems are to be positioned in the semi-floating floor. Core grooves can also be formed only for visual effects in the center of the floorboard for example, not shown.
  • FIG. 9a illustrates the exemplary embodiment of adding adhesives 53 with a machine 52 to the core 30, on the pre-formed surface of the core, according to the invention. This facilitates the top surface layer 31 to be attached onto the core after pressing.
  • any kind of adhesive can be used, e.g. polyvinyl acetate (PVA), aliphatic resin emulsion or other synthetic resins including resorcinol, urea-formaldehyde, phenol formaldehyde resin, etc., just to mention some.
  • PVA polyvinyl acetate
  • aliphatic resin emulsion or other synthetic resins including resorcinol, urea-formaldehyde, phenol formaldehyde resin, etc., just to mention some.
  • FIG. 9b illustrates the exemplary embodiment of humidifying 53 with a machine 52 the top surface layer 31', 31" prior to pressing, according to the invention.
  • This facilitates for example the bending of a wood fibre based top surface layer such as paper or wood veneer around the portions of the pre-formed groove 20 of the core 30, i.e. the surfaces which are lower than the main floor surface.
  • any way of humidifying 53 can be done, e.g. by spraying, steaming, painting liquid or lubricating, and any kind of humidifier 53 can be used such as, e.g. water, oil or wax, etc., just to mention some.
  • the top surface layer 31', 31" can be heated up to soften the top surface layer, which will then be more easily formed during pressing.
  • the method can be used to form the core grooves and the main floor surface in the same production step.
  • a paper impregnated with, for example, a thermosetting resin can be applied over the core groove and, under heat and pressure, thereby forming around the depression and curing the top surface layer.
  • the method is particularly suitable to form for example deep depressions in floorboards comprising a solid surface of wood fibres, binders and wear resistant particles.
  • the method does not exclude that the core and/or parts of the core groove are partly compressed during the application of the surface layer over the core groove.
  • FIG. 10a illustrates the exemplary embodiment where each floor panel 2', 2" is more or less covered by a separated sheet 31', 31" of a top surface layer, according to the invention.
  • FIG. 10b illustrates the embodiment, when the top surface layer 31"' is covering a whole floor element 3, which can be stretched out a bit when pressed down between the bevels 20, 20', 20", according to the invention.
  • FIG. 10c illustrates a close-up view of FIG. 10b where it can be seen that a thin top surface layer 31''' is applied to the core 30 such that it covers the core grooves.
  • top surface layer 31p is applied as powder, comprising fibres and binders, on the defined form following the contour of the pre-formed core.
  • a powder is WFF defined in WO 2009/065769 .
  • the powder applied over the core groove can be of a different color than the main floor surface. This could be used to form deep grout lines with a different colour or structure than the main floor surface.
  • the powder can be scattered to cover at least one core groove, and the powder can further then be lubricated if needed.
  • FIGs. 12a - 12c illustrate the exemplary embodiment of pressing on different top surface layer 31', 31", 31''', 31p in a first step, according to the invention, using e.g. a fixed pressure plate 54, with a defined form following the contour of the pre-formed core groves (20, 20', 20").
  • the pressing plate 54 shown can have any form that suits the surface layer to be pressed.
  • the top surface layer can be glued to the core or laminated under heat and pressure as an impregnated paper 31', 31", 31''' or applied as a powder 31p comprising fibres and binders.
  • FIG. 12d illustrates the second step where the pressing plate 54 is in a pressing position.
  • FIG. 12e shows the result after pressing.
  • Scraping, cutting or corroding can shape the surface structure of the upper surface of the core, and the sheets 31, 31', 31", 31''' of the top surface layer or powder mix then follows with the pressing.
  • the top surface layer can also be pre-processed before it is pressed, e.g. with scraping or cutting the laminate sheets 31, 31', 31''' with patterns.
  • the upper surface layer can comprise a moisture repellant material.
  • FIGs. 13a - 13b illustrate the embodiment of a soft pressuring equipment 54, 55, working for example with a soft mattress 55 between the flat formed press 54 and the top surface layer 31', 31", according to the invention.
  • the mattress 55 bulks out into where the open spaces are, due to the pre-formed core groves (20', 20") on the surface of the core 30.
  • the bulked part of the mattress 55 presses the top surface layer 31', 31" even over the surface laying lower, helping the top surface layer 31 to follow the contour of the core 30 surface, and attaching the top surface layer 31.
  • the pressing plate can have any form that suits the surface layer to be pressed together with the mattress 55.
  • FIGs. 14a - 14b illustrate the embodiment of a press plate 54 having only protruding portions 56 that are corresponding to the core groves (20', 20") and a roller 57 rolling over the top surface layer 31, according to the invention. Both the protruding portions 56 and roller 57 are following the contour surface, attaching the top surface layer to the surface of the core 30, particularly attaching the top surface layer to the pre-formed bevels 20.
  • FIG. 15 illustrates the embodiment of the step after the pressing step, which is separating the floor element 3 into floor panels 2 with a cutter 58.
  • FIGs. 16a-16f illustrate the embodiment of the different steps the floor element 3 go through during the production line, according to the invention.
  • FIG. 16a illustrates the floor element 3.
  • FIG. 16b illustrates the floor element 3 after the pre-forming of the core 30.
  • Top surface layer sheets 31' are applied in FIG. 16c . After pressing, the sheets are attached in FIG. 16d .
  • the floor element 3 is separated into floor panels 2 and the joint systems are machined in FIG. 16e.
  • FIG. 16f illustrates the surface layers not overlapping each other, an exemplary design of a mechanical joint system according to known art, not allowing semi-floating, where the manufacturing method according to the invention is suited for as well.
  • the exemplary embodiments of manufacturing methods, in FIGs. 8-16 can be used in the production of the exemplary embodiments of the building panel, in FIGs. 2-7 , with a special design of a mechanical joint system that allow semi-floating installation.
EP19206570.4A 2009-12-17 2010-12-17 Planches de plancher Pending EP3623543A1 (fr)

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SE0950980 2009-12-17
EP10838001.5A EP2513386B1 (fr) 2009-12-17 2010-12-17 Procédé et agencements concernant la formation de surface de panneaux de construction
PCT/SE2010/051418 WO2011075074A1 (fr) 2009-12-17 2010-12-17 Procédé et agencements concernant la formation de surface de panneaux de construction

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EP (2) EP3623543A1 (fr)
JP (1) JP5763096B2 (fr)
KR (1) KR101778006B1 (fr)
CN (1) CN102652201B (fr)
BR (1) BR112012013809B1 (fr)
CA (1) CA2782869C (fr)
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EP2513386B1 (fr) 2019-11-06
WO2011075074A1 (fr) 2011-06-23
RU2012127367A (ru) 2014-01-27
EP2513386A4 (fr) 2017-11-15
KR20120101491A (ko) 2012-09-13
UA107205C2 (uk) 2014-12-10
KR101778006B1 (ko) 2017-09-13
US20150361676A1 (en) 2015-12-17
CA2782869A1 (fr) 2011-06-23
CA2782869C (fr) 2018-02-13
EP2513386A1 (fr) 2012-10-24
US9169654B2 (en) 2015-10-27
US8591691B2 (en) 2013-11-26
US20140069044A1 (en) 2014-03-13
JP5763096B2 (ja) 2015-08-12
BR112012013809A2 (pt) 2016-05-03
JP2013514473A (ja) 2013-04-25
CN102652201B (zh) 2014-11-12
RU2540743C2 (ru) 2015-02-10
US9447587B2 (en) 2016-09-20
CN102652201A (zh) 2012-08-29
US20110146188A1 (en) 2011-06-23

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